大断面平顶地铁暗挖车站下穿既有建筑方案研究及变形控制——以北京地铁8号线三期前门站工程为例

张小伟; 张丽; 韩亚飞; 袁梦钊

doi:10.3973/j.issn.2096-4498.2021.06.010

隧道建设 >

2021 , Vol. 41 >Issue 6: 979 - 987

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.06.010

规划与设计

大断面平顶地铁暗挖车站下穿既有建筑方案研究及变形控制——以北京地铁8号线三期前门站工程为例

张小伟 ,
张丽 ,
韩亚飞 ,
袁梦钊

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(北京城建设计发展集团股份有限公司，北京〓100037）

张小伟（1983—），男，河北保定人，2009年毕业于同济大学，岩土工程专业，硕士，高级工程师，主要从事地下工程设计与研究工作。E-mail： 54046617@qq.com。

网络出版日期: 2021-07-01

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Scheme and Deformation Control of a Large CrossSection Flat Roofed Station Spanning Beneath Existing Buildings: 

a Case Study of Phase Ⅲ Qianmen Station Project of Beijing Metro Line 8

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(Beijing Urban Construction Design and Development Group Co., Ltd., Beijing 100037, China)

Online published: 2021-07-01

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摘要

下穿既有建（构）筑物工程施工逐渐由暗挖小断面施工发展为大断面施工。为有效控制下穿既有建（构）筑物的变形从而确保施工安全，有必要对下穿方案、变形情况及控制措施进行研究。结合8号线三期前门站下穿既有建筑具体工程，以变形控制为目标，从整体方案选择入手，对不同车站暗挖方案下既有建（构）筑物的沉降进行对比，最终提出管幕施工、导洞施工、桩基沉降及后期沉降控制等变形控制关键技术，并采用数值模拟和现场实测的方法对提出的管幕+深孔注浆+平顶4导洞PBA法方案进行分析。结果表明： 1）虽然大断面暗挖车站施工相比小断面暗挖施工变形大，但经过严密的方案比选并采取合理的控制措施后可以保证变形满足要求； 2）管幕+深孔注浆+平顶4导洞PBA法方案具有良好的变形控制能力，用于平顶结构非密贴下穿既有建筑施工是可行的； 3）实现变形控制目标需要全过程控制，从方案选择到施工的每一个环节均需采取对应措施。

关键词： 平顶地铁车站; 非密贴暗挖下穿; 变形控制; 数值模拟; 管幕; 4导洞PBA法; 全过程控制

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张小伟 , 张丽 , 韩亚飞 , 袁梦钊 .

大断面平顶地铁暗挖车站下穿既有建筑方案研究及变形控制——以北京地铁8号线三期前门站工程为例

[J]. 隧道建设, 2021 , 41(6) : 979 -987 . DOI: 10.3973/j.issn.2096-4498.2021.06.010

Abstract

The crosssection of mined constructions spanning beneath existing buildings/structures gradually increases with time. Undercrossing systems and deformation control measures should be studied to manage the deformation of existing buildings/structures and ensure construction safety. In this study, the deformations of existing buildings/structures undercrossed by Phase Ⅲ Qianmen station of Beijing metro line 8 with various schemes are compared. Furthermore, key deformation control measures such as pipecurtain construction, pilot tunnel construction, and pile foundation deformation control are proposed. Finally, numerical simulations and field tests are performed to analyze the feasibility of combining pipecurtain, deephole grouting, and flatroofed 4pilot pilebeamarch PBA methods. The results show the following: (1) The deformation induced by large crosssection construction is greater than that induced by small crosssection construction; however, the deformation of large crosssection construction can be successfully managed by adopting appropriate schemes and methods. (2) The combined scheme of pipecurtain, deephole grouting, and flatroofed 4pilot PBA methods exhibit an appreciable deformation control capacity, which is practical in nonclose undercrossing constructions. (3) The entire process control is necessary.

Key words： large crosssection flatroofed station; nonclose mined undercrossing constructions; deformation control; numerical simulation; pipe curtain; 4pilot pilebeamarch (PBA) method; entire process control

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